in the four decades since we left the moon behind nasa launched the shuttle program. what do the next 40 years look like. joining me is one of 24 we'll to have flown to the moon. colonel warden joins me from ever oh beach, florida. when you hear it's been 40 years season our last footsteps on the moon, how do you define those years? >> if i think about it being 40 years ago that tells me how old i am today. i was half my age when i flew. >> do you think -- how would you describe these past 40 years. we have made great strides. would you have liked to have seen us go back more often? >> i have mixed feelings about that. i'm not sure that we would really accomplish a lot more by going back to the moon. there are other thing we need to do. but i think people have to understand that the space program is a very, very long-term program. we are talking hundreds and thousands of years to get where we need to go. and the apollo program was a first small step in giving us the capability to do that sort of thing. it's been 40 years since the apollo program and we have take and s